Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Weighted average interest rate of debt outstanding.

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Loans Payable and Secured Line of Credit (Details Textual)			1 Months Ended		6 Months Ended	12 Months Ended
	Dec. 22, 2017 USD ($) ft²	May 11, 2016 USD ($)	May 31, 2018 USD ($)	Feb. 22, 2017 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Aug. 04, 2017 USD ($)
Long-term Line of Credit					$ 5,037,000	$ 0
Line of Credit Facility, Expiration Date				Feb. 22, 2019
Loans Payable					152,289,000	123,333,000
Debt Instrument, Interest Rate Terms			bearing interest at a blended average rate of 3.72% over the 30-day LIBOR, each with a one year extension option upon satisfaction of certain conditions.
Debt Instrument, Payment Terms			a guaranty of 25% of the principal amount, decreasing to 10% of the principal balance upon the debt yield ratio becoming equal to or greater than 7.0%.
Cash and Cash Equivalents, at Carrying Value					$ 9,048,000	$ 11,496,000		$ 15,155,000	$ 15,273,000
Maximum [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.50%	3.00%
Loans Payable [Member]
Debt Instrument, Interest Rate, Effective Percentage					6.12%	6.22%
Debt Instrument, Face Amount			$ 67,800,000
Letter of Credit [Member]
Debt Instrument, Interest Rate, Effective Percentage					4.40%
Loans Payable					$ 5,000,000
Landmarked Robert And Anne Dickey House [Member]
Area of Real Estate Property \| ft²	7,500
Sterling National Bank [Member]
Debt Instrument, Description of Variable Rate Basis				100		200
Line of Credit Facility, Maximum Borrowing Capacity				$ 12,000,000		$ 12,750,000				$ 11,000,000
Secured Debt											$ 2,900,000
Line of Credit Facility, Remaining Borrowing Capacity										$ 9,100,000
Debt Instrument, Maturity Date					Feb. 21, 2020
Interest Rate Cap [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value, Gross Asset					$ 11,000	$ 497,000
West Palm Beach Florida Loan [Member]
Debt Instrument, Interest Rate, Basis for Effective Rate		interest at 30-day LIBOR plus 230 basis points.
Debt Instrument, Interest Rate, Effective Percentage					4.70%	4.80%
Debt Instrument, Unamortized Premium		$ 14,000
Line of Credit Facility, Maximum Borrowing Capacity		12,600,000
Derivative, Notional Amount		9,100,000
Line of Credit Facility, Remaining Borrowing Capacity					$ 2,900,000
West Palm Beach Florida Loan [Member] \| Interest Rate Cap [Member] \| Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value, Gross Asset					$ 1,000
Greenwich Construction Loan [Member]
Debt Instrument, Interest Rate, Effective Percentage					10.65%	10.60%
Debt Instrument, Unamortized Premium	$ 393,000
Derivative, Notional Amount	189,500,000
Debt Instrument, Face Amount	$ 189,500,000
Number of Real Estate Properties	90
Debt Instrument, Description	(i) LIBOR plus 8.25% and (ii) 9.25%.
Loans Payable					$ 78,900,000	$ 51,500,000
Cash and Cash Equivalents, at Carrying Value	$ 15,000,000
Greenwich Construction Loan [Member] \| Letter of Credit [Member]
Loans Payable					$ 7,000,000	7,000,000
Greenwich Construction Loan [Member] \| Subsequent Event [Member]
Cash and Cash Equivalents, at Carrying Value							$ 10,000,000
Greenwich Construction Loan [Member] \| Multi Use Building [Member]
Area of Real Estate Property \| ft²	300,000
TPH Borrower [Member] \| West Palm Beach Florida Loan [Member]
Long-term Line of Credit		9,100,000
Derivative, Notional Amount		$ 9,700,000				$ 9,100,000
Canadian Imperial Bank of Commerce [Member] \| Loans Payable [Member]
Debt Instrument, Face Amount			52,400,000
Debt, Weighted Average Interest Rate					0.50%
RCG LV Debt VI REIT LLC [Member] \| Mezzanine Loan [Member]
Debt Instrument, Face Amount			$ 15,400,000